/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2021 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/


#ifndef MAPNIK_CSS_UNIT_VALUE_HPP
#define MAPNIK_CSS_UNIT_VALUE_HPP

#include <boost/spirit/home/x3.hpp>

namespace mapnik {

namespace x3 = boost::spirit::x3;

// units
struct css_unit_value : x3::symbols<double>
{
    constexpr static double DPI = 96;
    css_unit_value()
    {
        add
            ("px", 1.0)      // pixels
            ("pt", DPI/72.0) // points
            ("pc", DPI/6.0)  // picas
            ("mm", DPI/25.4) // milimeters
            ("Q" , DPI/101.6)// quarter-milimeters
            ("cm", DPI/2.54) // centimeters
            ("in", static_cast<double>(DPI)) // inches
            ;
    }
};

struct css_absolute_size : x3::symbols<double>
{
    constexpr static double EM = 10.0; // 1em == 10px
    css_absolute_size()
    {
        add
            ("xx-small", 0.6 * EM)
            ("x-small", 0.75 * EM)
            ("small",   0.88 * EM)
            ("medium",   1.0 * EM)
            ("large",    1.2 * EM)
            ("x-large",  1.5 * EM)
            ("xx-large", 2.0 * EM)
            ;
    }
};

struct css_relative_size : x3::symbols<double>
{
    css_relative_size()
    {
        add
            ("larger",  1.2)
            ("smaller", 0.8)
            ;
    }
};

} //mapnik

#endif //MAPNIK_CSS_GRAMMAR_X3_DEF_HPP
